Merge pull request #263 from sir051223/master

add default callback for fs.close to compitable with the higher version

binding/nodejs/index.js

@@ -122,7 +122,7 @@ class Searcher {
       }
     }
     if (fd) {
-      fs.close(fd)
+      fs.close(fd,function(){})
     }
 
     const diff = process.hrtime(startTime)
@@ -178,7 +178,7 @@ const loadVectorIndexFromFile = dbPath => {
   const fd = fs.openSync(dbPath, 'r')
   const buffer = Buffer.alloc(VectorIndexLength)
   fs.readSync(fd, buffer, 0, VectorIndexLength, 256)
-  fs.close(fd)
+  fs.close(fd,function(){})
   return buffer
 }
 
@@ -187,7 +187,7 @@ const loadContentFromFile = dbPath => {
   const buffer = Buffer.alloc(stats.size)
   const fd = fs.openSync(dbPath, 'r')
   fs.readSync(fd, buffer, 0, stats.size, 0)
-  fs.close(fd)
+  fs.close(fd,function(){})
   return buffer
 }